Supports write_timeout option

[zentetsukenz]

What is this?

This option, write_timeout, is available in Excon. It provides an ability to set a timeout in request writing operation.

Why we need this?

In normal Excon HTTPS request operation, there are 3 events occur in a life cycle of a request, connect, write and read. Savon currently provides open_timeout and read_timeout settings that are passed to HTTPI which again, in Excon case, are used as connect_timeout and read_timeout.

It would be better if we could have a fine control over write_timeout. Imagine if we have a service which have a very high traffic as a 3rd party. Sometimes that service stalls our request writing operation and do not start processing . But we don't want to wait for it if it doesn't start processing our request yet.

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[HashNotAdam]

I've created pull request #920 to fix this, however, it seems the test suite is failing on JRuby.

The problem I'm having is that the test suite failed on my computer before I made any changes yet it passes for C Ruby on Travis after my changes.

Given the fragility of the test suite, it's a bit hard for me to get Travis to pass without going for a deep dive into the tests that were already failing. Any insight into this would be appreciated.